Refactor & Optimize Remapping (NN & IDW) (#1244)

* remap refactor

* add remap accessor

* remove k check

* move variables in populate face centroids

* update docstring

* update remapping notebook

* update accessor

* update docstrings

* add docstring to kdtree

* update util docstrings

* add cmocean

* update todo comment

* keep scipy kdtree private for now

* update notebook markdown

* fix bug in isel

Author: philipc2

ci/docs.yml

@@ -4,6 +4,7 @@ channels:
 dependencies:
     - python
     - dask
+    - cmocean
     - netcdf4
     - numba
     - numpy